After power up, only blinking LCD
Please see youtube.
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Brand new, after 2-day printing. Prusa i3 MK2S became a brick. Very sad. Checked all fuses, all good. No one knows what happened or how to fix it. Customer Service could not fix the issue. Called Customer Service, waited 30 mins. No one picks up. Could be wrong time but the message is not english and no answering machine. bad bad bad.
Very very very disappointed!!!! No matter how bad the design is, just 2 days and stop working. Not acceptable.
Re: After power up, only blinking LCD
did you try to chat with the prusa team through the prusa store ?
things I would try:
disable every external device from the rambo board (LCD, endstops, steppers, pinda, heatbed, heatbed thermistor, hotend, hotend thermistor) and leave only the psu connected.
then connect the printer to your computer, power the printer up and start pronterface. try to connect with the printer (at the proper USB-port) and try to communicate with it (sending a command like M503 and wait for the response).
if the printer responds: add the components step by step (same order as above, first LCD, endstops ...).
by the way: we once had a user reporting a similar problem. at the end it turned out to be a shortcut at the hotend thermistor...
dem inscheniör is' nix zu schwör...